Earth Science Quiz

Earth was formed about _____ million years ago.

• 4,500

• 4,000

• 4,600

• 4,660

Earth orbits the sun, with its axis of rotation tilted at __degrees from its plane of orbit around the sun.

• 21.4

• 23.4

• 35.4

• 22.4

Earth is not a perfect _____.

• Sphere

• Square

• Circle

• Triangle

The _____ is the outermost layer of the earth.

• Core

• Crust

• Mantle

• None of the choices

The inner core is the center of the earth and it's about ___ thick.

• 1,500 kilometers

• 1,200 kilometers

• 1,400 kilometers

• 2,400 kilometers

The continental crust is composed mainly of ____.

• Limestone

• Iron

• Granite

• Nickle

The ____ has a high temperature of about 6,000 degrees Celsius?

• Mantle

• Crust

• Core

• None of the choices

The outer core is about ______ thick.

• 2,200 km

• 2,200 m

• 2,900 km

• 2,900 m

The oceanic crust is below the ocean and is sometimes called ____.

• SIMA

• SIAL

• SILA

• SIAM

The lower mantle is about ______thick.

• 400 kilometers

• 2,500 kilometers

• 2,200 kilometers

• 500 kilometers